<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" 
xmlns:layout="http://www.ultraq.net.nz/web/thymeleaf/layout">
<meta charset="UTF-8">
<title>验证码页面</title>
</head>
<body>
<h3>message: </h3>
<span th:text="${msg}"></span>
</body>
</html>